Depending on the gauge you will either need to wait for the appropriate ambient temperature or set the gauge accordingly to the ambient temperature.In this instance you may need to contact a mechanic. If your compressor is not coming on then either there is no refrigerant left in your system or the compressor may be faulty.
You should be able to see the pulley of the compressor spinning if it is working correctly. (A/C recharge kits come with a built-in pressure gauge.) Please note that it is critical that your compressor be running in order to check the pressure.
Once this is done you can now check the pressure gauge. If this is the case then you will need to visit a dealership as there are not recharge kits out there yet for 1234yf. A secondary scenario could be you have a newer car model you may in fact be using the new 1234yf refrigerant. The first and most likely is that you are trying to put it on the high pressure port instead of the low pressure. 
If you find that the coupler is not fitting onto your low side service port then stop! This could be a few things. (You may need to pull back the collar to connect the coupler.) The coupler should snap and lock into place. With the vehicle on then connect the coupler on your recharge kit to the low side service port that we identified in the first step. Ensure that the air conditioner is powered on to maximum cool and maximum blowing capacity. Once we have identified the service port we can now start the engine of your vehicle and turn on the air conditioner. Before doing anything please ensure that you are using the right port. If you are having trouble finding this port it is best to look up your car’s layout either online or in the instruction manual. To assist with this some cars have an ‘H’ on high pressure side and a ‘L’ on the low pressure port. An example picture of a low-side service port is to the right, just remember that each car is different. The low-side service port will always be on the larger sized aluminum tubing between the AC’s compressor and your car’s firewall. Before we do anything we first need to identify where the low-side service port is on your vehicle’s air conditioning system. Before we can use the 134a AC recharge kit you will need to unscrew the hose/gauge from the top of the can, pull off the seal, and then tightly screw back on the hose and gauge to the can. Always watch your surroundings and ensure that you are as safe as possible. Safety First – Be sure to put on safety eye glasses and mechanic’s gloves. #How to use ac recharge kit how to#
How To Use a AC Recharge Kit in 10 Steps! A thermometer showing outside temperature.Safety glasses and gloves – You don’t want any refrigerant burns, trust me!.Now that you have the kit in hand the question is how do you use it? Well folks let’s dive in and take a look: What You’ll Need You went on over to the auto-parts store or on and purchased yourself a R-134a air conditioner recharge kit. So it is summer and it’s a damn hot day and your car’s air conditioner is blowing warm air.
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